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6/6 Digit matrix

The digits can be rearranged in the matrix so that the sum of any row, whether horizontal, vertical, or diagonal, will equal fifteen. Which two numbers should be switched?

Any two numbers are as likely as the rest, as the difference between the numbers in the answer options is always one.

Surest way to approach question is via trial and error.

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What is tset spelt backwards?

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TNavarrosays...

Switching 7 and 8 will make the sum of any horizontal, vertical or diagonal row equal to 15.

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